52 EXPERIMENT STATION RECORD. [Vol.40 



overcome the chlorosis completely. The application of iron to the plants by 

 brushing or spraying the leaves with solutions of iron compounds was found 

 effective but apparently not commercially feasible. 



Relationship of fungus diseases to the watermelon industry. F. C. Meter 

 {Off. Minutes Melon Distributors' Assoc., 4 (1918), pp. 19-28).— This is in the 

 main a discussion of watermelon diseases and means to minimize losses there- 

 from, dealing specifically with anthracnose. wilt, and stem-end decay, and em- 

 phasizing the employment of systematic and thorough treatment both in the 

 field and at the car in ways which are outlined. 



Report of investigation of alleged spray injury to apricot buds. 6. P. Cray 

 [Mo. Bui. Cat. Com. Hort., 7 (1918), Xo. 7. p. 454).— As a result of the frequent 

 failure of apricot and the less extended failure of prune orchards to set fruit 

 normally during the spring of 1918. an investigation was undertaken, the main 

 conclusion from which is to the effect that the crude petroleum emulsion ap- 

 plied to apricot trees in January and February may have been a secondary, 

 though not the primary, cause. It is recommended that the application of this 

 treatment to apricots be delayed until there is an indication of a swelling of 

 the buds. The primary cause of bud injury is still regarded as unsettled. 



Notes on some fungus diseases and a new codling moth attacking the per- 

 simmon in Japan, T. Tanaka (Mo. Bui. Cat Com. Sort., 7 (1918), No. 7. pp. 

 461-468). — This very condensed account Includes the rung] Glccosporium kaki, 

 My.rospc/rium !:<ii:i, Phoma lutii. Mycosplueretta diospyri [Cercoapora kaki), 

 Fusirin'Hum dioapyra, Pcstaloz:id kaki, StypineUa mompa (Septobartdium 

 mom pa, HeKcobasidium mompa), and Botrytia diospiri, also a new codling moth 

 (Kakivoria flavofaaciata) attacking persimmon. 



Black smut of figs, R. W. HODGSON (Mo. But. Cat. Com. Hort.. 7 {1918), Xo. 

 ). pp. 188, 189, fig. 1). — Giving briefly the results to date of an incomplete and 

 now discontinued investigation of the black smut of fig, which has caused loss 

 to growers for a number of years, the author States that the associated fungus 

 (Bterigmatocyatia sp.), said to be identical with the organism causing internal 

 rot of pomegranates, may considerably discolor th< rdly or may jrive 



little or no external Indication of its presence. The rate of infection varies 

 with locality and weather and from season b >ri, ranging from 3 to 15 



per cent. 



Citrus diseases of Porto Rico. J. A. SteveNBOH {-four. Dept. Ayr. P. R 

 (/.''/St. Xo. 2. pp. 43-123, figs. 23). — This Dumber contains in condensed form the 

 results of work done by the author and others during about four years on 

 citrus diseases, some of which began to be noted as early as 1001 and to be 

 serious about 1913. A gradual spread of diseases is apparent, also an increase 

 in the virulence of some of them. Recommendations which proved practicable 

 elsewhere were often found to fall under the conditions existing in Porto Rico. 



After a general statement regarding the relation of cultural practices to 

 health and disease in citrus groves and a general account of methods of pre- 

 vention and control, specific diseases are treated in some detail. 



Progress report on citrus scab, L. R. Hesler (Porto Rico Bta. Rpt. 1917. pp. 

 SO, 31). — A preliminary account is given of experiments for the control of cit- 

 rus scab due to Oladosporium citri, the work having been started In February, 

 1917. This work consisted in comparing sprays and dusting materials iu two 

 groves on the island. 



In general, Bordeaux mixture was found more efficient in the control of 

 Bcab, but it also destroyed the scale parasitic fungi. On the other hand, the 

 sulphur fungicides were less effective for scab control but also less injurious 

 to the scale parasites. The author suggests that applications of a standard 



